Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Medium-frequency Electrical Resistance Sintering of Oxidized c.p. Iron Powder

Juan Manuel Montes Martos
,
Francisco Gómez Cuevas
ORCID logo ,
Fátima Ternero Fernández
* ORCID logo ,
Raquel Astacio López
,
Eduardo Sánchez Caballero
ORCID logo ,
Jesús Cintas Físico
ORCID logo
Version 1 : Received: 10 May 2018 / Approved: 10 May 2018 / Online: 10 May 2018 (15:34:08 CEST)

A peer-reviewed article of this Preprint also exists.

Montes, J.M.; Cuevas, F.G.; Ternero, F.; Astacio, R.; Caballero, E.S.; Cintas, J. Medium-Frequency Electrical Resistance Sintering of Oxidized C.P. Iron Powder. Metals 2018, 8, 426. Montes, J.M.; Cuevas, F.G.; Ternero, F.; Astacio, R.; Caballero, E.S.; Cintas, J. Medium-Frequency Electrical Resistance Sintering of Oxidized C.P. Iron Powder. Metals 2018, 8, 426.

Abstract

Commercially pure (c.p.) iron powders with a deliberate high degree of oxidation were consolidated by medium-frequency electrical resistance sintering (MF-ERS). This is a consolidation technique where pressure, and heat coming from a low-voltage and high-intensity electrical current, are simultaneously applied to a powder mass. In this work, the achieved densification rate is interpreted according to a qualitative microscopic model, based on the compacts global porosity and electrical resistance evolution. The effect of current intensity and sintering time on compacts was studied on the basis of micrographs revealing the porosity distribution inside the sintered compact. The microstructural characteristics of compacts consolidated by the traditional cold-press and furnace-sinter powder metallurgy route are compared with results of MF-ERS consolidation. The goodness of MF-ERS versus the problems of conventional sintering when working with oxidized powders is analyzed. The electrical consolidation allows to obtain higher densifications than the traditional route under non-reducing atmospheres.

Keywords

electrical resistance sintering; MF-ERS; FAST; ECAS; Iron; hot pressing; sintering; powder metallurgy

Subject

Engineering, Industrial and Manufacturing Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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